The invention discloses a dry heat exchanger of a cold water unit turbulent flow single-system. The heat exchanger comprises a shell, a copper pipe, a front end cover, a rear end cover and turbulenceplates; the shell is a cylindrical shell, and a water inlet, a water outlet, an exhaust hole and a drainage hole are formed in the shell; the inner wall surface of the copper pipe is smooth, and the outer wall surface of the copper pipe is threaded; the copper pipe serving as a medium channel is divided into two systems; the outer circumference of the rear end cover is installed to block the rearend of the shell through bolts, and a gasket is arranged between the rear end cover and the shell; and the turbulence plates are segmental circles with the radian exceeding the radian of a semicircle,and the segmental circles of every two adjacent turbulence plates are vertically located on the upper side and the lower side correspondingly. All the space of a whole evaporator is occupied by the shell, the water inlet and the water outlet of water and a medium are pre-arranged on the shell so that a large amount of space can be saved, and the design of a main machine is optimized; the water inlet and the water outlet are conveniently connected and installed through flanges, and maintenance and repair are easy; and the use frequency of the exhaust hole and the drainage hole is not high, thefailure rate is very low, and therefore, the leakage can be reduced by adopting the welding method.